About this 3D model

This is a mod of the original "Canon EF Extension Tube v1 - 50mm" (http://www.thingiverse.com/thing:74217) In order to ease printing without supports, I've split it into two pieces which can be easily glued together. ...and I've shortened it to 25mm as the Name says. Print both parts as ABS and easily glue them together with Acetone etc.